Along-wind aerodynamic damping of high-rise buildings with aerodynamically modified square cross-sections

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (22) : 84-89.

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Along-wind aerodynamic damping of high-rise buildings with aerodynamically modified square cross-sections

Cao Huilan，Quan Yong, Gu Ming

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Abstract

Along-wind aerodynamic damping ratios are identified from wind-induced responses of ten aeroelastic models in a simulated turbulence flow using the random decrement technique (RDT). Their validity is examined through comparison with previous research achievements and the results evaluated by quasi-steady theory. Based on them, the effects of aerodynamically modified cross-sections, such as chamfered corner and slotted corner, and tapering on aerodynamic damping of square high-rise buildings are investigated. Results indicate that: aerodynamic damping ratio increases as corner-cut ratio or taper ratio increases; low corner-cut ratios significantly decrease aerodynamic damping; however, modifications of building corners and tapering are not always effective at reducing the aerodynamic damping of tall buildings. According to the study of aerodynamic damping of square high-rise buildings and combining with the effect of corner-cut and tapering, an empirical aerodynamic damping function for high-rise buildings is proposed.

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high-rise building / wind-induced vibration / aerodynamic damping / aeroelastic model / wind tunnel test

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Cao Huilan;Quan Yong;Gu Ming. Along-wind aerodynamic damping of high-rise buildings with aerodynamically modified square cross-sections[J]. Journal of Vibration and Shock, 2012, 31(22): 84-89